Why can't I plot a graph?

MH LEE

2013 12 1

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%Hi guys. I am a noob here. I did Matlab and Simulink in Uni before but I am still a noob in it and hope to spent sometime to %learn Matlab. I just wanted to try plot an equation and my script is as follows:

syms x;
y = x^2 + 4*x + 4
plot (y)

%Answer:

>> pl1

y =

x^2 + 4*x + 4

Error using plot Conversion to double from sym is not possible.

Error in pl1 (line 5) plot (y)

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Wayne King 2013-12-1

编辑：Wayne King 2013-12-1

在 MATLAB Online 中打开

0 个投票

Why do you need to plot this symbolically:

   x = -2:0.01:2; % or whatever the range
   y = x.^2 + 4*x + 4;
   plot(x,y)

If you want to plot symbolically:

 syms x;
 ezplot(x^2+4*x+4,[-2 2])

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MH LEE 2013-12-1

Okay can can. Accepted your answers :D. than how come if dun put ez cannot plot the graph? Can i say as long anything i use symbolically, must put ez in front?